Hay Chuck - thanks for the response. I use the same loading formula you do - 9x23 brass run through my 9mm dies. The 9mm conversion is similar to the 308/30-06 conversion - it's a small formed piece of metal that gets fire-formed into the chamber and acts as a chamber shortener so the 9mm can be chambered and fired in the 9mm Largo chamber. I haven't used it yet because I wanted to load the 9x23 brass.
So far mine isn't all that accurate and I doubted I would get any improvement in accuracy by lengthening the distance from case mouth to rifling, so I haven't installed it. Instead, I have been playing with some cast loads using 121/125 gn slugs, hoping the larger diameter of the rn-125 grainers would give me a bit of better accuracy. I'll find out as soon as it stops snowing (lol).
I have tried some 160 gn -.355 diameter rn slugs but didn't get any great accuracy there either. My bore is nice and shiny but the rifling is pretty shallow.
I agree with you on the 30 Luger chambering, and would also like to see one is 7.62x25mm chambering. Of course, a nice little bolt rifle in 45 auto or 45 Colt would make a wonderful camp gun. But honestly, there's nothing wrong with that 30 Luger either.
Now, if someone would just start making these again, on this side of the pond, we might be able to have some real fun with them. That being said, ya'll gotta know that I would be a sucker for an AR-7 in something other than a 22lr. How does the song go - ain't no tellin' where the money went.....................LOL. Thanks again. Mikey.